Warming climate forcing impact from a sub-arctic peatland as a result of late Holocene permafrost aggradation and initiation of bare peat surfaces
| Autor: | Atte Korhola, Aleksi Räsänen, Minna Väliranta, Hui Zhang, Annalea Lohila, A. Britta K. Sannel, Dmitry Kaverin, Juha-Pekka Tuovinen, Carolina Voigt, Alexander V. Pastukhov, Eeva-Stiina Tuittila, Tarmo Virtanen, Pertti J. Martikainen, Christina Biasi, Maija E. Marushchak, Sanna Piilo |
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| Přispěvatelé: | Helsinki Institute of Sustainability Science (HELSUS), Ecosystems and Environment Research Programme, Biosciences, Environmental Change Research Unit (ECRU), Environmental Sciences |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
CARBON ACCUMULATION
DYNAMICS 010506 paleontology Archeology Peat NORTHERN 010504 meteorology & atmospheric sciences Permafrost peatland Permafrost initiation LOWLANDS Permafrost 01 natural sciences Aggradation Greenhouse gas forcing RECONSTRUCTION Ecology Evolution Behavior and Systematics Holocene EMISSIONS 1172 Environmental sciences 0105 earth and related environmental sciences Global and Planetary Change Global warming Geology 15. Life on land Radiative forcing Subarctic climate TUNDRA SOILS CANADA 13. Climate action Greenhouse gas QUEBEC Environmental science Physical geography Bare peat formations |
| Popis: | Effects of permafrost aggradation on greenhouse gas (GHG) dynamics and climate forcing have not been previously quantified. Here, we reconstruct changes in GHG balances over the late Holocene for a sub-arctic peatland by applying palaeoecological data combined with measured GHG flux data, focusing on the impact of permafrost aggradation in particular. Our data suggest that permafrost initiation around 3000 years ago resulted in GHG emissions, thereby slightly weakening the general long-term peatland cooling impact. As a novel discovery, based on our chronological data of bare peat surfaces, we found that current sporadic bare peat surfaces in subarctic regions are probably remnants of more extensive bare peat areas formed by permafrost initiation. Paradoxically, our data suggest that permafrost initiation triggered by the late Holocene cooling climate generated a positive radiative forcing and a short-term climate warming feedback, mitigating the general insolation-driven late Holocene summer cooling trend. Our work with historical data demonstrates the importance of permafrost peatland dynamics for atmospheric GHG concentrations, both in the past and future. It suggests that, while thawing permafrost is likely to initially trigger a change towards wetter conditions and consequent increase in CH4 forcing, eventually the accelerated C uptake capacity under warmer climate may overcome the thaw effect when a new hydrological balance becomes established. (C) 2021 Elsevier Ltd. All rights reserved. |
| Databáze: | OpenAIRE |
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